<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="文章详细"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->
        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
          <!-- 关注按钮组件 -->
          <!-- <FollowUser
            :isFollowed="article.is_followed"
            :userId="article.aut_id"
            @is-follow="article.is_followed = $event"
            class="follow-btn"
          /> -->
          <!-- 只读：props
            修改：自定义事件
            组件的v-model默认等于:isFollowed="article.is_followed"
            @is-follow="article.is_followed = $event"
            -->
          <FollowUser v-model="article.is_followed" :userId="article.aut_id" class="follow-btn" />
          <!-- /关注按钮组件 -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          ref="article-content"
          v-html="article.content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论 -->
        <ArticleComment
          :articleId="articleId"
          @comment-data="commentData = $event.total_count"
          :list="commentList"
        />
        <!-- /文章评论 -->
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isPostShow = true"
            >写评论</van-button
          >
          <van-icon name="comment-o" :info="commentData" color="#777"> </van-icon>
          <!-- 文章收藏按钮 -->
          <ArticleCollection v-model="article.is_collected" :articleId="article.art_id" />
          <!-- /文章收藏按钮 -->
          <!-- 文章点赞按钮 -->
          <ArticleLike v-model="article.attitude" :articleId="article.art_id"></ArticleLike>
          <!-- /文章点赞按钮 -->
          <!-- <van-icon name="share" color="#777777"></van-icon> -->
        </div>
        <!-- /底部区域 -->
        <!-- 评论弹出层 -->
        <van-popup v-model="isPostShow" position="bottom"
          ><CommentPost :target="article.art_id" @post-success="onPostSuccess"></CommentPost
        ></van-popup>
        <!-- /评论弹出层 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticle()">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
  </div>
</template>

<script>
import { getArticleById } from '@/api/article.js'
// 导入图片预览组件函数
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user'
import ArticleCollection from '@/components/article/article-collection'
import ArticleLike from '@/components/article/article-like'
import ArticleComment from '@/components/article/article-comment'
import CommentPost from '@/components/article/comment-post'

export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    ArticleCollection,
    ArticleLike,
    ArticleComment,
    CommentPost
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  data() {
    return {
      article: [], // 文章详细数据列表
      loading: true,
      errStatus: 0,
      commentData: 0, // 评论数量
      isPostShow: false, // 评论弹出层的显示状态
      commentList: [] // 评论列表
    }
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticle()
  },
  mounted() {},
  methods: {
    // 请求文章详细数据
    async loadArticle() {
      try {
        const { data } = await getArticleById(this.articleId)
        // 因为数据驱动视图不是立即的
        this.article = data.data

        // if (Math.random() > 0.5) {
        //   JSON.parse('dsankljdnskaljndlkjsa')
        // }

        setTimeout(() => {
          this.previewImage()
        }, 0)
      } catch (error) {
        // 判断是否有err响应体并且状态码是否等于404
        if (error.response && error.response.status === 404) {
          this.errStatus = 404
        }
      }

      this.loading = false // 关闭loading显示状态
    },
    previewImage() {
      const articleContent = this.$refs['article-content'] // 获取所有文章内容
      const imgs = articleContent.querySelectorAll('img') // 获取img元素

      const images = [] // 获取所有图片
      // 遍历每一项
      imgs.forEach((item, index) => {
        images.push(item.str) // 将每一项得src添加进imgStr
        // 给每一个img标签添加点击事件
        item.onclick = () => {
          ImagePreview({
            images, // 预览的图片数组
            startPosition: index // 图片起始位置
          })
        }
      })
    },
    onPostSuccess(data) {
      this.isPostShow = false // 关闭评论弹出层
      this.commentList.unshift(data.new_obj) // 将新发布评论添加评论列表顶部
    }
  }
}
</script>

<style scoped lang="less">
// 导入github-markdown.css文件
@import url('./github-markdown.css');
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 50px;
      border: 2px solid #eeeeee;
      font-size: 25px;
      line-height: 50px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
